NATs have become essential to laboratories, universities, oil companies, regional laboratories, contractors and consulting engineers, worldwide. Trials have demonstrated that NAT test results give excellent correlation with other test methods such as bending beam and wheel tracking.

The NAT provides the most inexpensive and userfriendly means of measuring and assessing the mechanical properties of asphaltic paving materials on a routine basis. It is designed to derive the maximum information about a material using either cores cut from the highway or laboratory moulded specimens.

Key Features

• Low cost dynamic loading universal test system ideally suited to testing asphalt and unbound granular materials
• Double acting low friction actuator with integral stroke transducer
• Utilises high performance ceramic spool servo-valve
• High quality stainless steel frame
• Issued with UKAS accredited certificate of calibration for EN 12697-24; EN12697-25, EN 12697-26
• Accessories available to perform a range of standard and non standard test methods
• Can be supplied with standard software to perform EN, ASTM andAASHTO test methods and universal software with which to design non standard test routines

Key Uses

• Assessment of resistance to permanent deformation (rutting)
• Measurement of stiffness modulus
• Assessment of resistance to fatigue cracking
• Resilient modulus of unbound materials
• Mix design

cDAC – ADVANCED DATA ACQUISITION SYSTEM

• 20 bit resolution, 5kHz per channel
• Will accept any voltage transducer in any channel using TEDS Thermocouples
• 1024 data points per cycle
• Up to 16 digital input & output channels
• Ethernet/USB/RS232 to PC communication

Software

• User friendly, intuitive and reliable Windows software developed using LabVIEW
• Standard test software available to meet specific EN, ASTM and AASHTO test methods
• Universal test software for the development of test methods using static, sinusoidal, haversine, square, triangular with user selected frequencies and data collection rates
• Stored test data can be imported into a spreadsheet package to be analysed by the user
• Utilities are included for transducer check, diagnostic routines and calibration

Specifications

¹ others available upon request